PPRuNe Forums - View Single Post - Air Asia Indonesia Lost Contact from Surabaya to Singapore
Old 30th Jan 2015, 21:49
  #2762 (permalink)  
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Join Date: Jun 2009
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@Gysbreght

Once again to keep from confusing the folks that don't fly the 'bus or any other FBW plane.

The fore/aft movement of the stick in the 'bus commands gee!!!!! It does not command AoA as the planes we flew 25 or 30 years ago ( except me, that did the FBW thing in 1979). The AoA briefly increases or decreases to achieve the pitch-corrected gee ( not like our Vipers, which was pure gee and we could actually trim for a gee). It does not command a pitch attitude!!! Once you relax the stick the thing only maintains the attitude because the gee command is corrected for pitch.

Sheesh. Long ago we had the "control stick steering", and the A/P would stay connected while we "corrected" our pitch or bank angle. As with the 'bus, we had max gee limits and AoA limits. Yeah. This was back in the mid-60's.

The 'bus seems to be a hybrid of pure A/P, control stick steering and the limits like max bank angles, and such. No biggie. But the reversion sequence seems to attempt to maintain as many "protections" as possible versus simply reverting to AoA and gee for pitch, and a reasonable roll rate.
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